Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8ef843839a5321…

MALICIOUS

PDF

45.5 KB Created: 2020-08-11 23:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 982c1eca253714348e7145097f93d78d SHA-1: f04122e7f6215295c22e1edfb99392e794f57e47 SHA-256: 3b8ef843839a53217968754f5a21d335a27f32e9bb816a6658060c4cde321e78
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious due to its inclusion of a link farm containing numerous external PDF links, with one prominent URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and references 'staff performance appraisal form pdf kenya', suggesting a lure. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=staff+performance+appraisal+form+pdf+kenya
    • http://files.sarahhoward.co.uk/uploads/1/3/2/6/132683142/8f063c2c10c9.pdf
    • http://files.luciopetroccione.com/uploads/1/3/1/4/131453944/67e41e.pdf
    • http://lebaregik.isocandles.com/uploads/1/3/1/8/131871674/mugivijararogewe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8538/0246/files/tidunimuxozotowob.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/nuselejebifulozameka.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/79455141873.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/6531550825.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/99058862277.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/kuguxebidupuzosalozuni.pdf
    • https://cdn.shopify.com/s/files/1/0429/4675/6774/files/47120848904.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8276/files/80361531470.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/2012089124.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7505/files/pavel_tsatsouline_stretching.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/wakikeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/11_human_body_systems_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/83602401340.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007183.bin
e32edd96fe20e80f8559426367fe3a94007a8b0c0a5de57e04cd8fa2c5cfb6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7183 5568 bytes
font_01_sfnt_off0000845f.bin
3a204316f672b16fa74844104857705025ff76a0b5bcb0bf8b352759c368d330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845F 10640 bytes

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